fix hardcoded match type (#6431)

Author: wing328

modules/openapi-generator/src/main/resources/powershell/model_anyof.mustache

@@ -46,7 +46,7 @@ function ConvertFrom-{{{apiNamePrefix}}}JsonTo{{{classname}}} {
 
                 foreach($property in $matchInstance.PsObject.Properties) {
                     if ($null -ne $property.Value) {
-                        $matchType = "Dog"
+                        $matchType = "{{{.}}}"
                         $match++
                         break
                     }

modules/openapi-generator/src/main/resources/powershell/model_oneof.mustache

@@ -45,7 +45,7 @@ function ConvertFrom-{{{apiNamePrefix}}}JsonTo{{{classname}}} {
 
             foreach($property in $matchInstance.PsObject.Properties) {
                 if ($null -ne $property.Value) {
-                    $matchType = "Dog"
+                    $matchType = "{{{.}}}"
                     $match++
                     break
                 }